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Over the last five years, I have been involved in more than 50 studies that involve this strategy. In all these studies, teachers used the strategy with one class but did not use it with another. Then they compared the results.

These studies have taught us several things about this six-step strategy. First, the strategy works at every grade level, from kindergarten to high school. Second, it works better if you use all the steps without leaving any out. In one middle school study, teachers found that the whole process enhanced students' achievement much more than the parts of the process in isolation did. Third, although the majority of studies indicate that the process enhances student achievement, some studies indicate that it doesn't.

For example, in one district in which 24 elementary teachers used the six-step process with one group of students but not with another, the average effect for using the strategy across all 24 elementary teachers was a 24-percentile-point gain. Six studies showed gains greater than 40 percentile points, but nine studies showed negative effects.

Happily, the research is also beginning to tell us what does or doesn't make the strategy work. Here's what we've learned so far:
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